Isetshenziselwa ukukhishwa kwensimbi nokuhlanzwa kwamaminerali angewona ensimbi ekucutshungulweni okumanzi, ikakhulukazi ukususwa kwensimbi emanzi yamaminerali angewona ensimbi njengesihlabathi se-quartz, i-potassium feldspar, ne-soda feldspar.Ngaphezu kwalokho, inokusebenza okuhle kokuhlukanisa kwababuthakathaka. Amaminerali kazibuthe afana ne-hematite, i-limonite, i-specularite, i-siderite, i-manganese ore, ne-tantalum-niobium ore.